Discoloration on toadstool ??
 

I have this Sarcophyton toadstool that I got a month ago. Its polyps are fairly extended but lately I noticed some discoloration patches on its body. Any idea what could these be. Do I need to treat it with medication.

It is in a 29g Bio-cube (top removed, has 175w MH instead). Water parameters:

ph 8.3
Am: 0
Nitrite 0
Nitrate less than 10 ppm
Alk 11 dKH

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